$E9F0/59888: Set Start of Line
Jump from $E57C, $E6F4, $E900, $E990, $EA01:
E9F0: BD F0 EC LDA $ECF0,X ; Low Byte Screen Line Addresses
E9F3: 85 D1 STA $D1 ; Pointer: Current Screen Line Address
E9F5: B5 D9 LDA $D9,X ; Screen Line Link Table
E9F7: 29 03 AND #$03
E9F9: 0D 88 02 ORA $0288 ; High Byte of Screen Memory Address
E9FC: 85 D2 STA $D2 ; Pointer: Current Screen Line Address
E9FE: 60 RTS
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